John harden



@hitch faire atrnt @fitta JHN HARDEN, 0F CHICAGO, ILLINOIS. Letters.Patent No. 73,245, 'flared January 14, ,1868.4

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOHN HARDEN, of Chicago, in the county of Cook, andState of Illinois, have invented an Anti-Friction Bearing for theWorking Parts of Machinery; and I do hereby declare that the followingis a full, clear, and exact description of the construction andoperation of the same, reference being had to the accompanying drawings,and letters marked thereon, making a part of this description, in which-Figure 1 is a section of one of the wings of a cross-head with myinvention attached. l

Figure 2, a plan view of the cross-head, showing also my device.

The nature of'my invention consists in 'making a counter-sink in, orcutting away so much of the slides of a. commoncross-head, or otherworking parts of machinery, as is necessary to receive glass or stonesets; and

in the use of an elastic bed for the glass to rest upon, for the purposeof providing means which will allow said glass or stone to expandwithout protruding above the surface of the metal in which it is set,and also for pre-- venting breakage. f

I know that glass and stone have been used for years as boxings, jewels,&c., buticlaim that the combination of stone or glass with metal, makinga compound bearing, is new, and when the. former is made to rest onexible beds is very durable, and when in-use causes much less frictionthan when metal bearings and boxes are employed.- Small boxes are nowmade of glass and stone and in many line chronometers pivots are made ofthe same material; but this ishinipracticable in the manufacture ofheavy machinery. Therefore, all that can be done to gain the benetit ofthe anti-friction properties of glass and stone is to insert so much ofit in the working parts of machinery as can be done without weakeningthe metal too much in which it is set.

In order to give a correct understanding of my device, I have markedcorresponding parts with similar letters, and will now give a detaileddescription. I l

A A represent the wings of the common cross-head, to which my device isapplied; and in order to set a series of glasses firmly in said wings, Ieither cast ordrill, as the case may require, depressions orcountersinks, of such depth and shape as will conform to the contourofthe under side ofthe glass, B,.as secrnat the sectional drawing, iig.fl.` If the depressions are drilled in the bearings, the latter shouldbe first turned and iitted up in the usual manner, after which theglass, d3, should bo ground of? so as to conform to the plane orperiphery of the surface of the working part. The glass can then set onpaper, or any suita-ble'iiexible material, d, and be packed, as seen atc, with Babbit metal, o,r any suitable material necessary to hold itfirmly in place. If the4 depressions are-cast in the bearings, they mustbe finished, so-ns to give a permanent seat forthepaper, d, and glass,B, to rest'on. When glass, B, is used in combination with a bearing orboxing, it can be made convex or concave, as thecase may require; bywhich means all of the. workingparts of machinery can have inserted nsucent number of sets B to receive all of the wear without materiallyweakening the metal in which they Vare pnt.

Having thus fully described my device, what I claim, and desire tosecure by Letters Patent, is-

The glass bearings B, in combination with the workin-g parts ofmachinery A, ilexible scat eZ, arranged asl set forth, and for thepurposes specified. i

JOI-IN HARDEN.

Witnesses:

Gno. S. GHAPIN, A. HAYWARD.

